Name.xs

   1 /* Copyright (C) 2004, 2008  Matthijs van Duin.  All rights reserved.
   2  * Copyright (C) 2014, cPanel Inc.  All rights reserved.
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the same terms as Perl itself.
   5  */
   6
   7 #include "EXTERN.h"
   8 #include "perl.h"
   9 #include "XSUB.h"
  10
  11 static MGVTBL subname_vtbl;
  12
  13 #ifndef PERL_MAGIC_ext
  14 # define PERL_MAGIC_ext '~'
  15 #endif
  16
  17 #ifndef SvMAGIC_set
  18 #define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
  19 #endif
  20
  21 #ifndef Newxz
  22 #define Newxz(ptr, num, type)   Newz(0, ptr, num, type)
  23 #endif
  24
  25 MODULE = Sub::Name  PACKAGE = Sub::Name
  26
  27 PROTOTYPES: DISABLE
  28
  29 void
  30 subname(name, sub)
  31         char *name
  32         SV *sub
  33     PREINIT:
  34         CV *cv = NULL;
  35         GV *gv;
  36         HV *stash = CopSTASH(PL_curcop);
  37         char *s, *end = NULL;
  38         MAGIC *mg;
  39     PPCODE:
  40         if (!SvROK(sub) && SvGMAGICAL(sub))
  41                 mg_get(sub);
  42         if (SvROK(sub))
  43                 cv = (CV *) SvRV(sub);
  44         else if (SvTYPE(sub) == SVt_PVGV)
  45                 cv = GvCVu(sub);
  46         else if (!SvOK(sub))
  47                 croak(PL_no_usym, "a subroutine");
  48         else if (PL_op->op_private & HINT_STRICT_REFS)
  49                 croak("Can't use string (\"%.32s\") as %s ref while \"strict refs\" in use",
  50                       SvPV_nolen(sub), "a subroutine");
  51         else if ((gv = gv_fetchpv(SvPV_nolen(sub), FALSE, SVt_PVCV)))
  52                 cv = GvCVu(gv);
  53         if (!cv)
  54                 croak("Undefined subroutine %s", SvPV_nolen(sub));
  55         if (SvTYPE(cv) != SVt_PVCV && SvTYPE(cv) != SVt_PVFM)
  56                 croak("Not a subroutine reference");
  57         for (s = name; *s++; ) {
  58                 if (*s == ':' && s[-1] == ':')
  59                         end = ++s;
  60                 else if (*s && s[-1] == '\'')
  61                         end = s;
  62         }
  63         s--;
  64         if (end) {
  65                 char *namepv = savepvn(name, end - name);
  66                 stash = GvHV(gv_fetchpv(namepv, TRUE, SVt_PVHV));
  67                 Safefree(namepv);
  68                 name = end;
  69         }
  70
  71         /* under debugger, provide information about sub location */
  72         if (PL_DBsub && CvGV(cv)) {
  73                 HV *hv = GvHV(PL_DBsub);
  74                 SV** old_data;
  75
  76                 char* new_pkg = HvNAME(stash);
  77
  78                 char* old_name = GvNAME( CvGV(cv) );
  79                 char* old_pkg = HvNAME( GvSTASH(CvGV(cv)) );
  80
  81                 int old_len = strlen(old_name) + strlen(old_pkg);
  82                 int new_len = strlen(name) + strlen(new_pkg);
  83
  84                 char* full_name;
  85                 Newxz(full_name, (old_len > new_len ? old_len : new_len) + 3, char);
  86
  87                 strcat(full_name, old_pkg);
  88                 strcat(full_name, "::");
  89                 strcat(full_name, old_name);
  90
  91                 old_data = hv_fetch(hv, full_name, strlen(full_name), 0);
  92
  93                 if (old_data) {
  94                         strcpy(full_name, new_pkg);
  95                         strcat(full_name, "::");
  96                         strcat(full_name, name);
  97
  98                         SvREFCNT_inc(*old_data);
  99                         if (!hv_store(hv, full_name, strlen(full_name), *old_data, 0))
 100                                 SvREFCNT_dec(*old_data);
 101                 }
 102                 Safefree(full_name);
 103         }
 104
 105         gv = (GV *) newSV(0);
 106         gv_init(gv, stash, name, s - name, TRUE);
 107
 108         mg = SvMAGIC(cv);
 109         while (mg && mg->mg_virtual != &subname_vtbl)
 110                 mg = mg->mg_moremagic;
 111         if (!mg) {
 112                 Newxz(mg, 1, MAGIC);
 113                 mg->mg_moremagic = SvMAGIC(cv);
 114                 mg->mg_type = PERL_MAGIC_ext;
 115                 mg->mg_virtual = &subname_vtbl;
 116                 SvMAGIC_set(cv, mg);
 117         }
 118         if (mg->mg_flags & MGf_REFCOUNTED)
 119                 SvREFCNT_dec(mg->mg_obj);
 120         mg->mg_flags |= MGf_REFCOUNTED;
 121         mg->mg_obj = (SV *) gv;
 122         SvRMAGICAL_on(cv);
 123         CvANON_off(cv);
 124 #ifndef CvGV_set
 125         CvGV(cv) = gv;
 126 #else
 127         CvGV_set(cv, gv);
 128 #endif
 129         PUSHs(sub);